AutoCodes – Mercury – P1309 Mercury

P1309 Mercury Code - Misfire Detection Monitor Not enabled

Quick Answer

Misfire Monitor Disabled When the misfire monitor is disabled, usually due to the input signal generated by the camshaft position (CMP) sensor, by sensing the passage of teeth from the CMP wheel. Common causes include Faulty Camshaft Position Sensor, Synchronize Assembly not properly installed, Verify the cam sensor is synchronized. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1309 Mercury indicates Misfire Detection Monitor Not enabled.
Common causes: Common causes include Faulty Camshaft Position Sensor, Synchronize Assembly not properly installed, Verify the cam sensor is synchronized.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,279

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 09, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1309 Mercury Description

Misfire Monitor Disabled When the misfire monitor is disabled, usually due to the input signal generated by the camshaft position (CMP) sensor, by sensing the passage of teeth from the CMP wheel.

OBDII Code P1309 Mercury - Misfire Detection Monitor Not enabled - AutoCodes.com — P1309 Mercury Code - Misfire Detection Monitor Not enabled

What does this mean?

What are the Possible Causes of the DTC P1309 Mercury?

Faulty Camshaft Position Sensor
Synchronize Assembly not properly installed.
Verify the cam sensor is synchronized
Faulty Powertrain Control Module (PCM)
Verify input sensor parameters are correct

How to Fix the DTC P1309 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Replacing the Camshaft Position Sensor (CMP) usually takes care of the problem, but if the sensor is installed out of synchronization it will produce the P1309 code. If the CMP is installed properly, REPLACE Powertrain Control Module (PCM). RESTORE vehicle. RERUN Quick Test .

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1309 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1309 Mercury code?

Need more information on how to fix the P1309 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1309 Mercury code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.